Date: 12 Jul 2006 19:58:42 -0000
From: research@...antec.com
To: bugtraq@...urityfocus.com
Subject: SYMSA-2006-004 (Full Details): Vulnerability in Graphics
 Rendering Engine Could Allow Remote Code Execution


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		Symantec Vulnerability Research
		http://www.symantec.com/research
			Security Advisory

Advisory ID   : SYMSA-2006-004
Advisory Title: Vulnerability in Graphics Rendering Engine Could
		Allow Remote Code Execution
Author        : Peter Ferrie / peter_ferrie@...antec.com
Release Date  : 06-13-2006 (no details), 07-13-2006 (full details)
Application   : Those which utilize the vulnerable function on
		affected platforms
Platform      : Windows 98, Windows 98 Second Edition, Windows
		Millennium Edition
Severity      : Remotely exploitable arbitrary code execution
Vendor status : Vendor verified, patch available (See MS06-026
		and KB918547)
CVE Number    : CVE-2006-2376
Reference     : http://www.securityfocus.com/bid/18322


Overview:

	A remote code execution vulnerability exists in the
	Graphics Rendering Engine because of the way that it
	handles Windows Metafile (WMF) images.

	An attacker could exploit this by placing a specially
	crafted WMF or EMF image on a webpage, or by sending
	the image as an attachment in an e-mail.  The exploit
	is triggered by viewing the specially crafted image
	file.  No user interaction is required.

	An attacker who successfully exploited this vulnerability
	could take complete control of the affected system.


Details:

	A heap overflow vulnerability exists in the WMF
	PolyPolygon function, because of an unchecked user-
	supplied parameter.

	Specifically, an integer overflow can occur because
	the sum of the entries in the vertex counts array is
	added to the number of polygons, then multiplied by
	six. This calculation is done without checking if the
	result overflows a 32-bit integer.

	The result is passed to a memory allocation routine,
	which will allocate a small memory buffer when an integer
	overflow occurs.  The allocated buffer will then be filled
	by the vertex data, which exceeds the size of the buffer,
	causing heap corruption.

	The manner of the heap corruption is under user control,
	which can result in the execution of arbitrary code.


Vendor Response:

	The above vulnerability was addressed for the affected
	platforms via Microsoft Security Bulletin MS06-026. If
	there are any further questions about this statement,
	please contact secure@...rosoft.com.


Recommendation:

	Follow your organization's testing procedures before
	applying patches or workarounds.  Customers should apply
	Microsoft's update as soon as possible.


Common Vulnerabilities and Exposures (CVE) Information:

The Common Vulnerabilities and Exposures (CVE) project has assigned
the following names to these issues.  These are candidates for
inclusion in the CVE list (http://cve.mitre.org), which standardizes
names for security problems.


	CVE-2006-2376

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- ---------------------------------------------------------------

Copyright (c) 2006 by Symantec Corp.
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